CVE-2025-9187 — Improper Restriction of Operations within the Bounds of a Memory Buffer in Mozilla Firefox

CWE-119 — Improper Restriction of Operations within the Bounds of a Memory Buffer8 documents7 sources
Severity
9.8CRITICALNVD
EPSS
0.1%
top 79.68%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Mozilla FirefoxMozilla Thunderbird
Timeline
PublishedAug 19

Description

Memory safety bugs present in Firefox 141 and Thunderbird 141. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 142 and Thunderbird 142.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HExploitability: 3.9 | Impact: 5.9

Affected Packages2 packages

▶NVDmozilla/firefox< 142.0
▶NVDmozilla/thunderbird< 142.0

🔴Vulnerability Details

3
GHSA
GHSA-6rqq-g95r-qrcc: Memory safety bugs present in Firefox 141 and Thunderbird 141↗2025-08-19
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OSV
CVE-2025-9187: Memory safety bugs present in Firefox 141 and Thunderbird 141↗2025-08-19
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CVEList
Memory safety bugs fixed in Firefox 142 and Thunderbird 142↗2025-08-19
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📋Vendor Advisories

4
Red Hat
firefox: thunderbird: Memory safety bugs fixed in Firefox 142 and Thunderbird 142↗2025-08-19
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Debian
CVE-2025-9187: firefox - Memory safety bugs present in Firefox 141 and Thunderbird 141. Some of these bug...↗2025
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Mozilla
Mozilla Foundation Security Advisory 2025-64: CVE-2025-9187↗
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Mozilla
Mozilla Foundation Security Advisory 2025-70: CVE-2025-9187↗
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CVE-2025-9187 — Mozilla Firefox vulnerability | cvebase